Java学习笔记 - 02

今天学习了Java的method.

在Pascal中，有返回值的“method”称为function，没有返回值的称为procedure。

C++中，统称为“函数”，Java中则称之为method。

对于有返回值的函数进行定义的时候，一定要有返回值，编译器会基础判断函数“可能没有返回值”的情况而报错。

e.g.

public static int sign(int n){
if (n > 0) return 1;
else if (n == 0) return 0;
else if (n < 0) return -1;
}

应当改为

public static int sign(int n){
if (n > 0) return 1;
else if (n == 0) return 0;
else return -1;
}

以下内容摘自<Introduction to Java Programming>.

Naming Conventions

Make sure that you choose descriptive names with straightforward meanings for the variables, constants, classes, and methods in your program. Names are case-sensitive. Listed below are the conventions for naming variables, methods, and classes.

* Use lowercase for variables and methods. If a name consists of several words, concatenate them into one, making the first word lowercase and capitalizing the first letter of each subsequent word.

* Capitalize the first letter of each word in a class name.

* Capitalize every letter in a constant, and use underscores between words.

* Choosing a unique name is important because your package may be used on the Internet by other programs. Java designers recommend that you use your Internet domain name in reverse order as a package prefix.